Table 3.
Density, acoustic impedance, and longitudinal wave velocity of US in biological tissues.
| Tissue | Density (Kg/m3) |
Longitudinal Wave Velocity (m/s) |
Acoustic Impedance (Kg/m2s) × 106 |
|---|---|---|---|
| Air | 1.2 | 330 | 0.0004 |
| Lung | 400 | 440–500 | 0.18–0.20 |
| Adipose tissue | 920 | 1460 | 1.35 |
| Water | 1000 | 1480 | 1.48 |
| Liver | 1060 | 1550 | 1.64 |
| Spleen | 1060 | 1560 | 1.65 |
| Blood | 1060 | 1560 | 1.62 |
| Kidney | 1040 | 1560 | 1.62 |
| Muscles | 1070 | 1590 | 1.70 |
| Connective tissue | 1120 | 1610 | 1.80 |
| Cartilage | 1100 | 1665 | 1.85 |
| Skin | 1150 | 1730 | 1.99 |
| Bone | 1380–1810 | 2700–4100 | 3.75–7.38 |